Expansion-pulley.



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WITNESSES 6% ATTOHNDG.

THE norms mzns ca, PuoTo-Ln'uoq WASHINGTON. o. c.

SIMON WV. VVARDWELL, JR, OF PROVIDENCE, RHODE ISLAND.

EXPANSlON-PULLEY.

SPECIFICATION forming part of Letters Patent N 0. 667,268, dated February 5, 1901.

Application filed June 15, 1900. Serial No. 20, L54. (N model.)

To all whom it may concern.-

Be it known that I, SIMON W. WARDWELL, Jr. a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Expansion- Pulleys, of which the following is 'a specification.

My invention relates to expansion-pulleys; and it consists of a pulley having two bevelededge disks receiving a split ring having an outer face adapted to receive a flat belt and beveled inner faces and connected to rotate with the disks, which are adjustable, as set forth hereinafter and as shown in the accompanying drawings, in which- Figure 1 is a side view of my expansionpulley. Fig. 2 is a section on the line 2 2, Fig. 1. Figs. 3 and at are sections of the disks. Fig. 5 is a section of the adjusting and retaining nut, and Fig. 6 is an edge view of the split ring.

The pulleyoonsists of twoseparate members in the form of bevel-disks A and B, mounted upon an axial member S, which may be a shaft or a sleeve on and secured to the shaft. Upon these portions are carried the conical or beveled-edge disks A and B, the hubs being internally threaded to engage the right and left handed screw portions 3 s, on which they are carried, and with their beveled edges so opposed that when the disks are closely abutted said beveled edges form a V-shaped groove. Upon these beveled edges is supported a split spring-ring 0, having its inner surface beveled from each side and connected to positively turn with the disks by means of a bearing engaging both disksas, for instance, a lug in the form of a staple a, suitably attached to the ring near the split and adapted to slots 00 00, out in the edges of the disks. This staple also serves to so connect the two disks A and B that when one-is rotated about the shaft S the other must be rotated with itand so that if one member is secured the other will be secured also. The

staple must be so located relatively to the movement of rotation of the pulley that the friction between the belt and ring will tend to carry the latter in the direction away from the staple, for were the tendency of the driving force to push the ring toward the staple the ring would be distended, altering the pitch of the pulley, and tend to break.

A circular nut T is attached to the hub of the disk B by means of two screws 7?, h and serves by binding against the screw-threads to clamp the disk in any position to which it may be adjusted. A small space is left between the nut and the hub of the disk B, so that by tightening the screws h h the nut may move inward, so that the disk and nut are tightly clamped to the shaft to hold the pulley from turning thereon. Incidentally the nut T serves as a handle whereby to turn the pulley, and to provide better convenience for handling it is so made that its outer portion overhangs the hub of the disk B.

To vary the diameter of the pulley, the two screws h h are loosened, so that the disks A and B and the nut T are free to turn on the shaft. By turning the nutT in one direction the disks A and B are caused to approach each other, thereby expanding the ring and increasing the diameter of the pulley. By turning the nut T in the reverse direction the disks are separated, permitting the ring to contract, and thus decreasing the diameter of the pulley. When the desired adjustment is obtained, both members of the pulley are clamped in position by tightening the screws h h.

In a companion application filed by me June 14, 1900, Serial No. 20,239, I have set forth and claimed a construction somewhat similar to that set forth and claimed herein.

Without limiting myself to the precise construction and arrangement of parts shown, I

the beveled edges of the disks and connected therewith and adapted to be expanded or to contract by varying the relative positions of the disks, and means for clamping the disks rigidly in any desired adjustment, substan-- tially as described.

2. The combination in an expansible pulley of an axial member having adjacent right and left screw-thread portions, beveled-edge disks mounted on the screw portions of said axial member to be adjusted in relative positions thereon and connected to be rotated in conjunction about said a-Xial member to adjust their relative positions, a split springring fitting the beveled edges of the disks and means for preventing the slipping thereon by a suitable connection therewith adjacent the split and adapted to be expanded or to contract by varying the relative positions of the disks, and a nut connected with one of the disks whereby the pulley can be clamped in any desired adjustment, substantially as set forth.

3. The combination in an expansible pulley of a shaft S having adjacent right and left screw-thread portions, circular bevelededge disks A and B fitted to the screw-threaded portions and adapted to be rotated conjunctively about the shaft to vary their relative positions, a split spring-ring 0 adapted to be expanded or to contract as the relative positions of the circular members are varied, a staple c, engaging opposed slots in the circular members to connect them and attached to the ring to prevent the latter from slipping, and a nut T connected by two screws to the disk member A whereby the pulley may be rigidly clamped to the shaft in any desired position of adjustment, substantially as set forth.

4. The combination of the shaft having right and left screw-threads, circular beveled-edge disks with threaded openings adapt ed to said threads, and a split ring adapted to the beveled edges of the disks and with a bearing engaging both disks, substantially as set forth.

5. The combination of the shaft having right and left screw-threads, circular beveled-edge disks with threaded openings adapt ed to said threads, a split ring adapted to the beveled edges of the disks and witha bearing engaging both disks, and means for binding one of the disks to the shaft, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

SIMON W. WARDWELL, JR.

Witnesses:

JOSHUA B. HALE, EDWIN 0. SMITH. 

